package stringhomework;

import string.StringBuilderDemo;

public class StringbuilderDemo {
    public static void main(String[] args) {
        String str="好好学习Java";
        StringBuilder builder=new StringBuilder(str);
        builder.append(",为了找个好工作");
        System.out.println(builder);

        builder.replace(9,16,"就是为了改变世界");
        System.out.println(builder);

        builder.delete(0,9);
        System.out.println(builder);


        builder.insert(0,"活着");
    }
}
